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In this paper, the structure of ferroelectric cathode with a low dielectric constant film introduced between the ferroelectric material and the grid has been studied for increasing the triple junction electric field. Finite Element software ANSYS electric module is used for modeling of ferroelectric cathodes and basic geometry that was modeled is depicted in Figure 1. A voltage is applied on the rear...
In this paper a normally-on driving under-gate FED is proposed. In this structure, the ratio of the cathode width to the thickness of the dielectric layer is reduced significantly comparing with the traditional under-gate FED. In the new driving scheme, the field emission electrons are extracted from the whole cathode surface by the high anode voltage directly. The effect of the under-gate is to prevent...
In this paper, the cathode evaporation rate during current emission is measured. The quartz crystal microbalance (QCM) method is used to measure the thickness of the deposited active materials in vacuum. The principle of the QCM is that a frequency shift is introduced when evaporated materials are deposited on the crystal. The evaporation of active materials is measured at different cathode temperature...
In the present paper, the field emission properties of mixture of carbon nanotubes, ZnO tetrapods and conductive particles is discussed. To improve the field-emission further, a field-emission cathode with special edge structure is proposed in this paper. In Figure 1, the silver cathode electrode is first coated on a glass substrate. Then, carbon nanotubes are deposited on the cathode electrode as...
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